FreeCalypso > hg > fc-magnetite
view src/gpf2/osl/os_sem_ir.c @ 680:ee3ac8c617cb
armio.c: set GPIO2 output high initially
On TI-canonical platforms GPIO2 is DCD modem control output. In TI's
original code the AI_InitIOConfig() function called from Init_Target()
would configure GPIO2 as an output and set the initial output value to
low, but then the init code in uartfax.c called from Init_Serial_Flows()
would immediately change it to high, corresponding to DCD not asserted.
The result is a momentary asserted-state glitch on the DCD output.
The present change eliminates this glitch, setting DCD output to
not-asserted initially like it should be.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 25 Jun 2020 03:17:43 +0000 |
parents | 094ecae40880 |
children |
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/* * This C module is a reconstruction based on the disassembly of * os_sem.obj in frame_na7_db_ir.lib from the Leonardo package. */ /* set of included headers from COFF symtab: */ #include <stdio.h> #include <string.h> #include "nucleus.h" #include "typedefs.h" #include "os.h" #include "gdi.h" #include "os_types.h" #include "os_glob.h" extern T_OS_SEM_TABLE_ENTRY SemTable[]; extern unsigned os_time_to_tick_multiplier; int ReleaseSemaphoreCB(NU_SEMAPHORE *SemCB) { if (NU_Release_Semaphore(SemCB) == NU_SUCCESS) return(OS_OK); else return(OS_ERROR); } GLOBAL LONG os_ReleaseSemaphore(OS_HANDLE TaskHandle, OS_HANDLE SemHandle) { if (NU_Release_Semaphore(&SemTable[SemHandle].SemCB) == NU_SUCCESS) return(OS_OK); else return(OS_ERROR); } int ObtainSemaphoreCB(NU_SEMAPHORE *SemCB, ULONG Timeout, USHORT wait_check) { UNSIGNED nu_timeout; STATUS sts; int ret; ret = OS_OK; if (Timeout != OS_SUSPEND) nu_timeout = TIME_TO_SYSTEM_TICKS(Timeout); else if (wait_check == 1) nu_timeout = 1; else nu_timeout = NU_SUSPEND; for (;;) { sts = NU_Obtain_Semaphore(SemCB, nu_timeout); switch (sts) { case NU_SUCCESS: return(ret); case NU_INVALID_SEMAPHORE: return(OS_ERROR); case NU_INVALID_SUSPEND: nu_timeout = 0; continue; case NU_TIMEOUT: case NU_UNAVAILABLE: if (nu_timeout == 1 && wait_check == 1) { nu_timeout = NU_SUSPEND; ret = OS_WAITED; continue; } return(OS_TIMEOUT); default: /* * Disassembly reveals that the original code * has an endless loop here, the equivalent * of continue. My guess is that they simply * forgot the default case, and so control * falls onto the closing brace of the switch * and then onto the closing brace of the for * loop. But I prefer better error handling, * hence the present addition. - Space Falcon */ return(OS_ERROR); } } } GLOBAL LONG os_ObtainSemaphore(OS_HANDLE TaskHandle, OS_HANDLE SemHandle, ULONG Timeout) { if (SemHandle > MaxSemaphores) return(OS_ERROR); return ObtainSemaphoreCB(&SemTable[SemHandle].SemCB, Timeout, 0); }